Java is pervasive at Google. Check out the Guava library and Google Guice for examples of how they adapted it for high-scalability web services. On top off ed

Java is pervasive at Google. Check out the Guava library and Google Guice for examples of how they adapted it for high-scalability web services. On top off edwinnathaniel's list, add Google Sites, Google Docs, and Mapreduce frameworks such as Flume Java.